Maester Seymour + Crystalline Crawler + Najeela, the Blade-Blossom
Produces: Infinite colored mana, Infinite combat phases, Infinite +1/+1 counters on creatures you control
- Maester Seymour
- Crystalline Crawler
- Najeela, the Blade-Blossom
- Color identity
- WUBRG
Steps
- At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Crystalline Crawler.
- Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding {W}{U}{B}{R}{G}.
- Activate Najeela by paying {W}{U}{B}{R}{G}, untapping all attacking creatures you control and causing you to get an additional combat phase after this one.
- Repeat.